Is it a bug with parameter collection?

Development Rendering
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1

I have a simple parameter collection (screen_01) and a simple material (screen_02).
But when I compile this material it uses only first one parameter from the list (screen_03).
Am I doing something wrong or this is a bug?
I am using 4.7.4

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2

Well…
While I’m investigated this bug, I rename parameters, delete them and add new ones to the list, etc… it just fixed them self.
I don’t know how, but now it works! And i didn’t notice any regularity of this bug

3

I’m having this problem too. I’m using 24 parameters and only the second one is reverting to the Parameter name no matter what I do. I’ve been trying to fix this for 3 days now and having had the same luck of it just automatically working again.

NKos, do you remember the order of operations you took when it finally fixed itself?

4

When you create your Parameter collection DON’T use duplicate

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Just use Adds element

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And i still think that there is a bug

5

Hi NKos -

I have reported the issue with Duplicated Parameters in the Collection Parameters as UE-17063. Your use of the add instead of the duplicate is the intended way to add new parameters to the MPC.

Thank You

Eric Ketchum

6

I can add my confirmation that this worked for me. Thank you, NKos

7

omg… I was having this same problem!
THANKS!

8

I also (just) had this bug (4.11.2).

I duplicated a collection parameter element and renamed it like I have always done without issue. (It is quicker to duplicate and edit an element in a collection if the names are incremental, e.g. myVal_1, myVal_2, etc).

Today, however, the value for an element I duplicated was not being read from my material as expected. I saw NKos’ post and decided to delete the erroneous element and recreate it using [+Add] instead of [Duplicate] which indeed fixes (well …works around) the bug.

9

It seems this issue still exists in some fashion. I’m in 4.15.0 and couldn’t, for the life of me, figure out why my MPC wasn’t updating when being called by a BP. The really odd thing is that it had been working for 3 months and I hadn’t touched it. I found this thread, tried deleting the parameter element and recreating it, and it works again.

10

Fixed it for me as well and I am using 4.22 … any news on fixing this definetly ?

11

Well, just now try it in 4.20.3 and all works well, duplicate and add.
So I believe it’s fixed.